On Wed, Apr 03, 2019 at 10:49:07AM +1030, Joel Stanley wrote:
> This describes the ASPEED BMC SoC's display controller.
>
> Signed-off-by: Joel Stanley <joel@xxxxxxxxx>
> Reviewed-by: Andrew Jeffery <andrew@xxxxxxxx>
> ---
> v3:
> Add Andrew's reviewed-by
>
> .../devicetree/bindings/gpu/aspeed-gfx.txt | 41 +++++++++++++++++++
> 1 file changed, 41 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/gpu/aspeed-gfx.txt
>
> diff --git a/Documentation/devicetree/bindings/gpu/aspeed-gfx.txt b/Documentation/devicetree/bindings/gpu/aspeed-gfx.txt
> new file mode 100644
> index 000000000000..a74033332668
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpu/aspeed-gfx.txt
> @@ -0,0 +1,41 @@
> +Device tree configuration for the GFX display deivce on the AST2500 SoCs.
> +
> +Required properties:
> + - compatible
> + * Must be one of the following:
> + + aspeed,ast2500-gfx
> + + aspeed,ast2400-gfx
> + * In addition, the ASPEED pinctrl bindings require the 'syscon' property to
> + be present
> +
> + - reg: Physical base address and length of the GFX registers
> +
> + - interrupts: interrupt number for the GFX device
> +
> + - clocks: clock number used to generate the pixel clock
> +
> + - resets: reset line that must be released to use the GFX device
> +
> + - memory-region:
> + Phandle to a memory region to allocate from, as defined in
> + Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
If required, does that mean the h/w can only use certain memory? Why?
> +
> +
> +Example:
> +
> +gfx: display@1e6e6000 {
> + compatible = "aspeed,ast2500-gfx", "syscon";
> + reg = <0x1e6e6000 0x1000>;
> + reg-io-width = <4>;
Not documented as used. This should be implied by the compatible though.
> + clocks = <&syscon ASPEED_CLK_GATE_D1CLK>;
> + resets = <&syscon ASPEED_RESET_CRT1>;
> + interrupts = <0x19>;
> + memory-region = <&gfx_memory>;
> +};
> +
> +gfx_memory: framebuffer {
> + size = <0x01000000>;
> + alignment = <0x01000000>;
> + compatible = "shared-dma-pool";
> + reusable;
> +};
> --
> 2.20.1
>
